Open a new file with
680x265 px and 7
2 dpi.
Choose an appropriate picture’s fragment from any Mu Online site with one condition. It must fill in the file’s sizes.

Take the next instrument

and represent the lowest layer painted in black for the lateral menu of the site’s header.

Copy this new made layer applying the parameters form the table below.
Fill 0% on the layers.
Blending Options-Inner Shadow
Blending Options-Gradient Overlay
Gradient’s parameters: